#include <time.h>
#include <stdlib.h>
#include <stdio.h>

int THRESHOLD = (int) RAND_MAX * 0.95;

void do_in_section(int inside) {
  if (!inside) {
    printf("outside\n");
  }
}

void start(void) {};
void stop(void) {};

int main() {
  srand(time(NULL));
  
  for (int i = 0; i < 100; i++) {
    if (rand() > THRESHOLD) do_in_section(0);
    
    start();
    do_in_section(1);
    stop();
  }
}